TIA-569-B-1
(Addendum to TIA-569-B)
May 2009
Commercial Building Standard for
Telecommunications Pathways and Spaces
Addendum 1- Temperature and Humidity
Requirements for Telecommunications
Spaces
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TIA-569-B-1
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COMMERCIAL BUILDING STANDARD FOR TELECOMMUNICATIONS PATHWAYS AND SPACES
ADDENDUM 1 – TEMPERATURE AND HUMIDITY REQUIREMENTS FOR TELECOMMUNI-CATIONS SPACES
Table of Contents
FOREWORD...ii
1 SCOPE ...1
2 NORMATIVE REFERENCES ...1
3 DEFINITIONS, ACRONYMS AND ABBREVIATIONS ...1
3.1 General...1
3.2 Definitions...1
3.3 Acronyms and abbreviations...1
4 MODIFICATION TO OPERATING LIMITS ...1
5 MODIFICATIONS TO TIA-569-B...2
5.1 Access provider and service provider space operational parameters ...2
5.2 Common equipment room operational parameters ...2
5.3 Common telecommunications room operational parameters...2
5.4 Telecommunications enclosure operational parameters ...2
5.5 Telecommunications room HVAC ...3
5.6 Telecommunications room operational parameters ...3
5.7 Equipment room operational parameters ...3
5.8 Entrance room operating parameters ...3
5.9 Revised temperature and humidity requirements for telecommunications spaces .3 Annex A (informative) References...5
List of Tables Table 18: Temperature and humidity requirements for telecommunication spaces ...4
TIA-569-B-1
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FOREWORD
(This foreword is not part of this Standard.)
This Addendum has been prepared by the TR-42.3 Subcommittee and approved by TR-42.3 and the TR-42 Engineering Committee.
There is one annex to this Addendum. Annex A is informative and not considered part of this Addendum.
TIA-569-B-1
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1 SCOPE
This Addendum specifies revised requirements for temperature and humidity in commercial building telecommunications spaces to harmonize with environmental guidelines developed by ASHRAE. These revised requirements should reduce energy consumption for heating, ventila-tion, and air conditioning; and should provide more flexibility in maintaining temperature and humidity in telecommunications spaces.
2 NORMATIVE REFERENCES
The following standards contain provisions which, through reference in this text, constitute pro-visions of this Addendum. At the time of publication, the editions indicated were valid. All stan-dards are subject to revision, and parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated be-low.
ASHRAE, Thermal Guidelines for Data Processing Environments, 2004
ASHRAE, 2008 ASHRAE Environmental Guidelines for Datacom Equipment –
Expand-ing the Recommended Environmental Envelope, 2008
3 DEFINITIONS, ACRONYMS AND ABBREVIATIONS
3.1 General
For the purposes of this Addendum the following definitions, acronyms, and abbreviations apply.
3.2 Definitions
dew point: The temperature to which air must be cooled (assuming constant air pressure and
moisture content) to reach a relative humidity of 100% (i.e., saturation).
dry-bulb temperature: The temperature of air measured by a thermometer freely exposed to
the air but shielded from radiation (e.g. sunlight, radiant heat) and moisture.
3.3 Acronyms and abbreviations
ASHRAE American Society of Heating, Refrigerating, and Air-Conditioning Engineers ESD electrostatic discharge
RH relative humidity
4 MODIFICATION TO OPERATING LIMITS
Modifications to the operating limits are based on ASHRAE, New Environmental Guidelines for
Datacom Equipment – Expanding the Recommended Environmental Envelope, 2008.
ASHRAE has determined that electrostatic discharge (ESD) is a function of dew point or abso-lute humidity and not relative humidity. Thus, the lower operating ranges for humidity have been modified to be based on dew point rather than relative humidity.
Upper limits for relative humidity and dew point have been specified to reduce failures caused by conductive anodic filament growth on printed circuit board laminate materials.
It should be noted that the change from 25 to 27 C (77 to 81 F) can have a detrimental effect on acoustical noise and fan power for equipment, because equipment fan utilization can increase dramatically as inlet temperatures increase. Equipment manufacturers should be consulted when considering ambient inlet temperatures near 27C (81 F).
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The lower temperature limit has been reduced to improve the efficiency of heating, ventilation and air conditioning (HVAC) systems by avoiding the need to mix hot return air to maintain the pre-vious 20 C (68 F) limit. However, it should also be noted that there is a risk of freezing the coil of direct expansion air conditioning units that deliver air temperatures below 20C (68 F).
5 MODIFICATIONS TO TIA-569-B
Modifications to the text of TIA-569-B are described below – deleted text is struck through; add-ed text is underlinadd-ed.
5.1 Access provider and service provider space operational parameters
The requirements in 5.5.2.2.4 shall be revised as follows:
Access provider and service provider space temperature and humidity shall be controlled to meet the requirements of Clause 9. provide continuous operating ranges of 18C (65 F) to 24C (75 F) with 30% to 55% relative humidity. Humidification and dehumidification equip-ment may be required depending upon local environequip-mental conditions.
The ambient temperature and humidity shall be measured at a distance of 1.5 m (5 ft) above the floor level, after the equipment is in operation, at any point along an equipment aisle centerline. Access provider and service provider spaces should not have exterior windows, as exterior win-dows may increase heat load.
5.2 Common equipment room operational parameters
The requirements in 6.2.5.2.2.3 shall be revised as follows:
Common equipment room temperature and humidity shall be controlled to meet the require-ments of Clause 9. Where HVAC is provided to the CER, the temperature and humidity shall be controlled to provide continuous operating ranges of 18C (64 F) to 24 C (75 F) with 30% to 55% relative humidity. Humidification and dehumidification equipment may be required depend-ing upon local environmental conditions.
The ambient temperature and humidity shall be measured at a distance of 1.5 m (5 ft) above the floor level, after the equipment is in operation, at any point along an equipment aisle centerline. Common equipment rooms should not have exterior windows, as exterior windows may in-crease heat load.
5.3 Common telecommunications room operational parameters
The requirements in 6.3.5.2 shall be revised as follows:
Common telecommunications room temperature and humidity shall be controlled to meet the requirements of Clause 9. The CTR may require environmental control depending upon the vo-lume and design of electronic equipment. Electronic equipment is often designed to operate in hostile environments, outside the 18 °C to 24 °C (65 °F to 75 °F) range. As a guideline for cool-ing a standard CTR, provide 9 m3(300 ft3) of 12 °C (55 °F) conditioned air per 20 A dedicated receptacle.
5.4 Telecommunications enclosure operational parameters
The requirements in 7.10.5.2.1.1 shall be revised as follows:
When active devices are present or will be installed in the telecommunications enclosure, a me-chanism to remove the generated heat shall be included to avoid any detrimental effect to the active contents of the telecommunications enclosure. Refer to the active device manufacturer
TIA-569-B-1
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for specific guidance on temperature and humidity limitations of the active equipment. Temper-ature and humidity inside the telecommunications enclosure shall meet the requirements of Clause 9.
5.5 Telecommunications room HVAC
The requirements in 7.11.5.2.1 shall be revised as follows:
HVAC shall be included in the design of the telecommunications room to maintain a tempera-ture the same as the adjacent office area and humidity within the operating ranges specified in Clause 9.
5.6 Telecommunications room operational parameters
The requirements in 7.11.5.2.1.3 shall be revised as follows:
A positive pressure shall be maintained with a minimum of one air change per hour, or as re-quired by applicable code. When active devices (heat producing equipment) are present, a suf-ficient number of air changes should be provided to dissipate the heat.
5.7 Equipment room operational parameters
The requirements in 7.12.4.2.2.3 shall be revised as follows:
The temperature and humidity shall be controlled to provide continuous operating ranges speci-fied in Clause 9. of 18oC (64oF) to 24oC (75oF) with 30% to 55% relative humidity. Humidifica-tion and dehumidificaHumidifica-tion equipment may be required depending upon local environmental con-ditions.
The ambient temperature and humidity shall be measured at a distance of 1.5 m (5 ft) above the floor level, after the equipment is in operation, at any point along an equipment aisle center line. Equipment rooms should not have exterior windows, as exterior windows may increase heat load.
5.8 Entrance room operating parameters
Add clause 7.13.7
7.13.7 HVAC
The temperature and humidity of entrance rooms shall be controlled to provide continuous op-erating ranges specified in Clause 9.
5.9 Revised temperature and humidity requirements for telecommunications spaces
Insert Clause 9 and Table 18 into TIA-569-B.
9 Temperature and humidity requirements for telecommunications spaces
Temperature and humidity in telecommunications spaces shall be controlled to provide conti-nuous operating ranges as specified in Table 18.
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Table 18: Temperature and humidity requirements for telecommunication spaces
Space Environmental requirements Equipment rooms, common
equipment rooms, access provid-er spaces, and sprovid-ervice providprovid-er spaces
Temperature: 18 – 27 C (64 – 81 F) dry bulb
o High altitude: reduce maximum dry-bulb tempera-ture 1ºC for every 300m (1.8ºF for every 1000 ft) above 1800 m (5900 ft) altitude.
Maximum Relative Humidity (RH): 60% Maximum dew point: 15 C (59 F)
Minimum dew point (lower moisture limit): 5.5 C (42 F)1
Maximum rate of temperature change: 5 C (9 F) per hour
Telecommunications rooms, common telecommunications rooms, telecommunications en-closures, and entrance rooms2
Temperature: 5 – 35 C (41 – 95 F) dry bulb.
o High altitude: reduce maximum dry-bulb tempera-ture 1C / 300m (1.8 F/1000 ft) above 900 m (3000 ft) altitude.
o Diskettes: minimum temperature with diskette in a drive is 10C (50 F).
Reduce maximum dry-bulb temperature 1 C / 300m (1.8 F/1000 ft) above 900 m (3000 ft) altitude. Minimum temperature with diskette in a drive is 10C (50 F). Relative Humidity: 8 - 80%
Maximum dew point: 28 C (82 F) Notes:
1. Dewpoint of 5.5C (41.9 F) - corresponds to approximately 44% RH at 18 C (64 F) and 25% RH at 27C (81 F).
2. Entrance rooms may have more restrictive temperature and humidity conditions de-pending on the requirements of the providers that place equipment in these spaces.
The temperature and humidity shall be measured while the equipment is in operation. Temper-ature and humidity shall be measured at air intakes of operating (powered) equipment. Except in telecommunications enclosures, temperature and humidity should be measured at a distance of 1.5 m (5 ft) above the floor level every 3 to 9 m (10 to 30 ft) along the center line of the aisles at the front of the cabinets or racks. In telecommunications enclosures the temperature and humidity should be measured as near as practical to the center of the enclosure. Temperature measurements should be taken at several locations of the air intake of any equipment with po-tential cooling problems. Refer to ASHRAE Thermal Guidelines for Data Processing Equipment and 2008 ASHRAE Environmental Guidelines for Datacom Equipment – Expanding the
Rec-ommended Environmental Envelope for more detailed guidelines for measuring and evaluating
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Annex A (informative) References
This annex is informative and is not part of this Addendum.
The organization listed below can be contacted to obtain reference information.
ASHRAE
American Society of Heating, Refrigerating and Air-Conditioning Engineers 1791 Tullie Circle, NE
Atlanta, GA 30329 (800) 527-4723 (404) 636-8400 www.ashrae.org
